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# Senior Python Developer w/ Payments, Credit Card or Debit Card

- **Company:** Intersources Inc.
- **Location:** Jersey City, NJ, United States
- **Experience:** Expert
- **Salary:** $26,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Applications Architecture, Microsoft Azure, Cloud Engineering, Continuous Integration, Software Design Patterns, Distributed Systems, Payment Systems, Google Wallet, Python (Programming Language), Service-Oriented Architecture, Software Engineering, SQLAlchemy, Tokenization, Code Structure, Fastapi, Event Driven Architecture, Pytest, Kubernetes, Apache Kafka, Domain Driven Development, ISO 8583, Api Design, Api Management, Docker, Microservices
- **Published:** June 2, 2026
- **Apply:** https://www2.jobdiva.com/portal/?a=62jdnw10t7d77ytz0lbaey9qxonk3b05a9tqw96rb7z6hlfo7xj79l9g6mp6aj2o&compid=0/jobs/32394728#/jobs/32394728

## About the Role

* 10+ years of software engineering; 5+ years at principal-level or above
 * Expert Python: FastAPI, asyncio, Pydantic, SQLAlchemy, pytest
 * Strong application architecture background - microservices, event-driven design, DDD, clean/hexagonal architecture
 * Solid understanding of card network processing: authorization flows, ISO 8583, clearing, settlement, chargebacks
 * Experience building high-throughput, low-latency distributed systems in production
 * Proficiency with Kafka or equivalent async messaging patterns
 * Strong written and verbal communication; able to align technical and business stakeholders, * Card network certification experience (Visa, Mastercard, PIN debit)
 * Familiarity with tokenization (EMVCo), 3-D Secure, or digital wallet integrations
 * Cloud development on AWS, GCP, or Azure with Kubernetes/Docker
 * Background modernizing legacy payment platforms
 * Experience authoring enterprise-level engineering RFCs or technical standards

## Description

* Architect and develop Python microservices and APIs integrating with Visa, Mastercard, and debit networks (Interlink, Pulse, NYCE, STAR)
 * Own application design across core domains: authorization, clearing, settlement, dispute management, and fraud
 * Define data models, event schemas, and API contracts across card processing platforms
 * Lead architecture reviews and produce ADRs for new capabilities and modernization efforts
 * Build internal frameworks, libraries, and SDKs used across card technology teams
 * Establish Python engineering standards - code structure, testing, CI/CD, observability, and API design
 * Drive decomposition of legacy and mainframe-adjacent systems into clean service-oriented architectures
 * Mentor staff and senior engineers on design patterns and software craftsmanship


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